Description
The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one holding the Admin role (CWE-347). Deployments running the FAB auth manager with the Azure AD OAuth login path under its default configuration are affected; the Authentik path already defaulted to `True`. This issue affects `apache-airflow-providers-fab` before 3.7.3. Users are advised to upgrade to `apache-airflow-providers-fab` 3.7.3, which defaults `verify_signature=True`.
Affected products
apache: apache-airflow-providers-fab
References3
- lists.apache.org/thread/x4784l7z00tl3gw4tv2dmvoon77rxgpl Mailing ListVendor Advisory
- github.com/apache/airflow/pull/69374 Patch
- www.openwall.com/lists/oss-security/2026/07/28/10 Mailing ListThird Party Advisory
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 51 · as of 13 November 2026
- CWE
- CWE-347
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